INGREDIENTS
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1 1/2 cups all purpose flour
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1 1/2 cups old fashioned oats
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3/4 cups light brown sugar
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1/2 teaspoon kosher salt
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1 cup cold butter, cubed
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1/2 cup granulated sugar
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3 tablespoons cornstarch
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2 1/2 cups blueberries
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1 tablespoon lemon juice